user
Calculate the length of an arc with the following parameters.
Angle of arc = 90°
Radius = 5m


assistant
The length of an arc with an angle of 90° and a radius of 5m is 8.66m. This can be calculated using the formula L = rθ, where L is the arc length, r is the radius, and θ is the angle in radians. In this case, θ = pi/2, so the arc length is 8.66m.